package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.dto.SetmealDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetMealDishMapper setMealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和口味
     * @param dishDTO
     */
    @Override
    // 添加这个注解是为了确保事务原子性，
    // 因为在此次操作中，包含对菜品表和口味表两张表的操作
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        // 对象转换
        Dish dish = new Dish();
        // 属性拷贝BeanUtils
        BeanUtils.copyProperties(dishDTO, dish);

        // 公共字段自动填充
        // 通过之前配置的 AutoFillAspect 实现

        // 向菜品表插入一条数据
        dishMapper.saveWithFlavor(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        // 口味表的数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            // 向口味表插入n条数据
            dishFlavorMapper.saveBatch(flavors);
        }
    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        // 调用PageHelper的startPage方法
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        // 获取总页数和每页记录数
        long total = page.getTotal();
        List<DishVO> list = page.getResult();

        return new PageResult(total, list);
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        // 判断当前菜品是否能够删除 --是否存在起售中的菜品
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus().equals(StatusConstant.ENABLE)) {
                // 当前菜品处于起售状态，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否能够删除 --是否被套餐关联
        List<Long> setMealIds = setMealDishMapper.getSetMealIdsByDishIds(ids);
        if (setMealIds != null && !setMealIds.isEmpty()) {
            // 当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        /*// 删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteBatch(id);
            // 删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        // 根据菜品id集合批量删除菜品数据
        // sql：delete from dish where id in (x,x,x...)
        dishMapper.deleteByIds(ids);

        // 根据菜品id集合批量删除关联的口味数据
        // sql：delete from dish_flavor where dish_id in (x,x,x...)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        // 返回的DishVO对象
        DishVO dishVO = new DishVO();

        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        // 将查询到的数据封装到DishVO对象中
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 修改菜品和对应的口味数据
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改菜品表基本信息
        dishMapper.update(dish);

        // 删除原有的口味数据
        // 获取当前菜品id
        Long dishId = dishDTO.getId();
        dishFlavorMapper.deleteByDishId(dishId);
        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            // 向口味表插入n条数据
            dishFlavorMapper.saveBatch(flavors);
        }
    }

    /**
     * 修改菜品启售停售状态
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        // 如果菜品状态为停售，则判断当前菜品是否被套餐关联，如果被套餐关联，则对应的套餐也要停售
        if (StatusConstant.DISABLE.equals(status)) {
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // 根据菜品id查询套餐id
            List<Long> setMealIds = setMealDishMapper.getSetmealIdsByDishIds(dishIds);
            // 判断当前菜品是否被套餐关联
            if (setMealIds != null && !setMealIds.isEmpty()) {
                for (Long setMealId : setMealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setMealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                   setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getById(Long categoryId) {
        // 已经停售的菜品不展示
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.DishForCategoryId(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.DishForCategoryId(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
